I have a 2003 Tahoe and my wife and I love it. However it seems that the autoride is not as smooth as it once was. When it is started I can hear the pump run for a few secondsand stops or at times sounds like if it sticks on but if i go back and touch the pump its not running.We have 45000 mi on it,5.3 ltr flex fuel eng,4wd, auto. Alsoit sounds as though the alternator bearing is going out as it squeaks on start up and have not had any luck getting it replacedand I have an extended warranty. Lastweekend the wipers started acting strange. Thanks for listening any advice would be appeciated.